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Normal Distribution Central limit theorum

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AAA reports that the average time it takes to respond to a emergency is 25 minutes with a STDV of 4.5 min. For a randomly selected sample of 5 response calls what is the probability that the average wait time is less than 22 minutes for emergency?

Oct 17th, 2017

Z score =( 22 -25)/ 2.5/SQR5 = -3/1.118 = -2.68

P(z=<-2.67) = 0.0037

Mar 14th, 2015

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